PPE
What does PPE stand for?
Personal Protective Equipment
What color should circuit 29 in a 3 phase 120/208 volts system?
Blue
These safety devices, mandatory in modern kitchens and bathrooms, are designed to protect people by shutting off power when they detect a current leakage to ground as low as 4 to 6 milliamperes?
What is a GFCI (or Ground Fault Circuit Interrupter)
One-half inch contains this many eighths of an inch.
What is 4 eighths?
This particle in an atom carries a negative electrical charge.
What is an electron?
When should PPE be inspected?
before each use
What color should circuit 38 in a 3 phase 277/480 volts system?
Brown
What is the purpose for an equipment grounding consuctor?
Provide an effective ground-fault current path
Adding 3/8 inch and 5/8 inch gives this total measurement.
What is 1 inch?
Copper is used for wiring because it readily allows electric charge to move. Materials with this property have this name.
What are conductors?
Why are leather protectors commonly worn over rubber insulating gloves?
To protect the insulating rubber against physical damage
What color should circuit 67 in a 3 phase 120/208 volts system?
Black
What is the formula for Ohm's Law?
V = I x R Volt's = Current (amps) x Resistance (ohms)
A length of 6 feet 8 inches equals this many inches.
What is 80 inches? (6 x 12 + 8.)
This phenomenon produces voltage in a coil when the magnetic flux linking the coil changes.
What is electromagnetic induction?
What is the primary purpose of arc-rated clothing?
reduce the severity of burns from the thermal effects of an arc flash
What color should circuit 39 in a 3 phase 277/480 volts system?
Orange
What is the purpose of a disconnect switch?
Provide a means to isolate electrical equipment from its power source
A 10-foot piece has 2 feet 7-1/2 inches removed. Ignoring saw kerf, this length remains.
What is 7 feet 4-1/2 inches?
In an ideal inductive AC circuit, current has this timing relationship to voltage: leads, lags, or stays in phase.
What is lags the voltage?
Arc flash face shields with balaclava are generally only permitted up to __ cal/cm²?
12 cal/cm²
What color should circuit 16 in a 1 phase 120/240 volts system?
Red
What does a transformer do?
Changes AC voltage thought electromagnetic induction
Three 36-inch pieces are cut from a 120-inch length, with three cuts each consuming a 1/8-inch kerf. This is the remaining length.
What is 11-5/8 inches? (120 - 108 - 3/8.)
An AC load uses 800 watts of real power and 1,000 volt-amperes of apparent power. This is its power factor.
What is 0.80, or 80 percent? (Power factor = watts / VA.)